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Lake Titicaca
By Henry Cooper

Lake Titicaca is the world's highest lake navigable to large vessels, lying at 12,500 feet (3,810 m) above sea level in the Andes Mountains of South America, astride the border between Peru to the west and Bolivia to the east. Titicaca is the second largest lake of South America (after Maracaibo in Venezuela).

It covers some 3,200 square miles (8,300 square km) and extends in a northwest-to-southeast direction for a distance of 120 miles (190 km). It is 50 miles (80 km) across at its widest point. A narrow strait, Tiquina, separates the lake into two bodies of water.

The smaller, in the southeast, is called Lake Huinaymarca in Bolivia and Lake Pequeno in Peru; the larger, in the northwest, is called Lake Chucuito in Bolivia and Lake Grande in Peru.

The meaning of the name Titicaca is uncertain, but it has been variously translated as Rock of the Puma or Crag of Lead. Titicaca lies between Andean ranges in a vast basin (about 22,400 square miles [58,000 square km] in area) that comprises most of the Altiplano (High Plateau) of the northern Andes. In the snow-covered Cordillera Real on the northeastern (Bolivian) shore of the lake, some of the highest peaks in the Andes rise to heights of more than 21,000 feet (6,400 m).

The lake averages between 460 and 600 feet (140 and 180 m) in depth, but the bottom tilts sharply toward the Bolivian shore, reaching its greatest recorded depth of 920 feet (280 m) off Isla Soto in the lake's northeast corner.

More than 25 rivers empty their waters into Titicaca; the largest, the Ramis, draining about two-fifths of the entire Titicaca Basin, enters the northwestern corner of the lake. One small river, the Desaguadero, drains the lake at its southern end. This single outlet empties only 5 percent of the lake's excess water; the rest is lost by evaporation under the fierce sun and strong winds of the dry Altiplano.

Lake Titicaca's fish life consists principally of two species of killifish (Orestias)--a small fish, usually striped or barred with black--and a catfish (Trichomycterus). In 1939, and subsequently, trout were introduced into Titicaca. A large frog (Telmatobius), which may reach a length of nearly a foot, inhabits the shallower regions of the lake.

Forty-one islands, some of them densely populated, rise from Titicaca's waters. The largest, Titicaca Island (Spanish: Isla de Titicaca, also called Isla del Sol), lies just off the tip of the Copacabana Peninsula in Bolivia.

Ruins on the shore and on the islands attest to the previous existence of one of the oldest civilizations known in the Americas, antedating the Christian era. The chief site is at Tiahuanaco, Bolivia, at the southern end of the lake. On Titicaca Island ruins of a temple mark the spot where, according to the tradition of the Incas (a Quechuan people of Peru who established an empire about 1100), the legendary founders of the Inca dynasty, Manco Capac and Mama Ocllo, were sent down to Earth by the Sun.

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